function eatsometing(day) {

	// var day = 4;
	console.log('day=',day);
	switch (day) {
		case 1:
			// ...
			// ...
			console.log('今天吃牛肉面');
			break;
		case 2:
			// ...
			console.log('今天吃羊肉泡');
			break;
		case 3:
			// ...
			console.log('今天吃干锅千叶豆腐');
			break;
		default:
			console.log('今天吃臊子面');
			break;
	}

}

var day = 1;

eatsometing(day);

